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https://github.com/crskycode/GARbro.git
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152 lines
6.1 KiB
C#
152 lines
6.1 KiB
C#
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//! \file ArcPCS.cs
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//! \date Mon Jan 25 01:36:53 2016
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//! \brief C's ware resource archive.
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//
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// Copyright (C) 2016 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System;
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using System.Collections.Generic;
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using System.ComponentModel.Composition;
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using System.IO;
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using GameRes.Utility;
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namespace GameRes.Formats.CsWare
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{
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internal class PcsEntry : Entry
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{
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public byte Key;
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}
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[Export(typeof(ArchiveFormat))]
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public class PcsOpener : ArchiveFormat
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{
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public override string Tag { get { return "PCS"; } }
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public override string Description { get { return "C's ware resource archive"; } }
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public override uint Signature { get { return 0x53434350; } } // 'PCCS'
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public override bool IsHierarchic { get { return false; } }
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public override bool CanCreate { get { return false; } }
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public override ArcFile TryOpen (ArcView file)
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{
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int version = file.View.ReadUInt16 (4);
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if (version < 1 || version > 4)
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return null;
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int count = file.View.ReadInt32 (8);
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if (!IsSaneCount (count))
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return null;
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uint data_offset = file.View.ReadUInt32 (12);
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int index_size = (int)data_offset - 0x10;
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int index_offset = 0x10;
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var index_buffer = new byte[0x40];
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var dir = new List<Entry> (count);
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for (int i = 0; i < count; ++i)
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{
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int name_length;
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if (version > 1)
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{
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name_length = file.View.ReadInt32 (index_offset);
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if (0 == name_length)
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break;
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if (name_length > index_size)
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return null;
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index_offset += 5 + name_length;
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}
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name_length = file.View.ReadInt32 (index_offset);
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if (0 == name_length)
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break;
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if (name_length > index_size)
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return null;
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if (name_length > index_buffer.Length)
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index_buffer = new byte[name_length];
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file.View.Read (index_offset+5, index_buffer, 0, (uint)name_length);
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index_offset += 5 + name_length;
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byte checksum;
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var name = DecryptName (index_buffer, name_length, out checksum);
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Entry entry;
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if (4 == version)
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{
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entry = FormatCatalog.Instance.Create<PcsEntry> (name);
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(entry as PcsEntry).Key = checksum;
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int c = -1 - checksum;
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file.View.Read (index_offset, index_buffer, 0, 8);
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for (int j = 0; j < 4; ++j)
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{
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byte key = (byte)((checksum + (17 << j)) & 0x33);
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index_buffer[j] = (byte)(c + key - index_buffer[j]);
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index_buffer[j+4] = (byte)(c + key - index_buffer[j+4]);
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}
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entry.Offset = LittleEndian.ToUInt32 (index_buffer, 0);
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entry.Size = LittleEndian.ToUInt32 (index_buffer, 4);
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}
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else
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{
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entry = FormatCatalog.Instance.Create<Entry> (name);
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entry.Offset = file.View.ReadUInt32 (index_offset);
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entry.Size = file.View.ReadUInt32 (index_offset+4);
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}
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index_offset += 0x10;
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if (index_offset > data_offset)
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return null;
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entry.Offset += data_offset;
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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dir.Add (entry);
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}
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if (0 == dir.Count)
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return null;
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return new ArcFile (file, this, dir);
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}
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public override Stream OpenEntry (ArcFile arc, Entry entry)
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{
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var pent = entry as PcsEntry;
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if (null == pent)
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return base.OpenEntry (arc, entry);
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uint header_size = Math.Min (entry.Size, 512u);
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var header = arc.File.View.ReadBytes (entry.Offset, header_size);
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for (int i = 0; i < header.Length; ++i)
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{
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header[i] = (byte)(pent.Key - header[i] - 1);
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}
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if (header_size == entry.Size)
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return new MemoryStream (header);
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var rest = arc.File.CreateStream (entry.Offset+512, entry.Size-512);
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return new PrefixStream (header, rest);
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}
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string DecryptName (byte[] name_buffer, int length, out byte checksum)
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{
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int count;
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checksum = 0;
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for (count = 0; count < length; ++count)
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{
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if (0 == name_buffer[count])
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break;
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name_buffer[count] = Binary.RotByteL (name_buffer[count], 4);
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checksum += name_buffer[count];
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}
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return Encodings.cp932.GetString (name_buffer, 0, count);
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}
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}
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}
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